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I have just asked a question about the Facebook JavaScript SDK and was about to propose this change myself when I noticed your question. However, I also noticed that the facebook-jssdk tag now does have a tag wiki excerpt, which is identical to that of facebook-javascript-sdk.

I think this is just going to lead to further confusion when tagging a question - I chose the "facebook-javascript-sdk" tag purely because it has more questions (1027). "facebook-jssdk" has 147.

I do not have the required upvotes in those tags to propse the synonym, so hopefully someone else can get this done.